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< 51Cxx | 51-XX | 51Exx >
51-XX Geometry {For algebraic geometry, see 14-XX}
51Dxx Geometric closure systems
51D05   Abstract (Maeda) geometries
51D10   Abstract geometries with exchange axiom
51D15   Abstract geometries with parallelism
51D20   Combinatorial geometries [See also 05B25, 05B35]
51D25   Lattices of subspaces [See also 05B35]
51D30   Continuous geometries and related topics [See also 06Cxx]
51D99   None of the above, but in this section
< 51Cxx | 51-XX | 51Exx >
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